Sun 2/120 value?

[chan at portal.com]

A friend who does not have access to the net asked me to see if I could
find out what a Sun 2/120 donated to him personally by someone at his work
is worth.  He's thinking of selling it and would like to know a fair
price.  Is there a blue book of used (somewhat obsolete) computer prices?
(Him selling his has piqued my interest enough to consider buying a more
powerful, but used Sun (or other unix box) for myself.)

Here's some info copied off the system:

Model Sun 2/120, part # 600-1013-02, date 15-feb-85
has Sun 2 monitor (p # 540-1062-01), keyboard, usual mouse systems mouse
and back panel moxes marked:  video keyboard mouse, sio-a sio-b,
no-10227, ethernet, 340-1049-01, 340-1049-01 (2 of 'em)
(did not get the chance to pull the cards and write them down...)

seems to run like I remember them running.  boots up saying (in part):

total 7427, 41771 (ie seems to have 42M disk & 1/2 inch tape drive),
size 460248+7090+64656 bytes,
Sun 4.2 rel 3.2 #1 c 1986, mem 7168K, available 6432768, 
ethernet x:x:xx:x:xx:xx, sd0: micropolis 1325, cyl 1022, alt 2 hd 8 sel 17
using 100 buffers containing 679936 bytes of main memory

Has Frame Maker and Frame Writer 1.11 nov 12, 1987, which seems to have
been it's only use.

Please reply to chan at portal.com.  Thanks in advance...

Jeff Chan
chan at portal.com